58 II. .1. Verwiebe — Berea Formation. 



Thick- 

 ness Total 

 No. Driller's terms Geological equivalent Feet Feet 



10. Blue Monday (40-foot) Cony sandstone 40 602 



9. Shale blue Riceville 100 562 



8. Shale red 100 462 



7. First sand Top of Venango oil 



group 50 362 



6. Slate and shale 100 312 



5. Salt sand Venango 2d oil sand 30 212 



4. Slate and shells 90 182 



3. Gray sand Stray 3d 12 92 



2. Slate and shells 40 80 



1. Third sand Base of Venango group 40 40 



This record was furnished by Mr. L. N. Stevenson, a we'll 

 driller residing in Petroleum Center, Pa. It was drilled by 

 him in July, 1915, for Mr. Robert Foggans on the Clarke farm 

 near Shamberg (about 3 miles east of Miller Farm), Venango 

 Co., Pa. The correlations indicated in the second column are 

 based on a careful study of the rocks on the outcrop in the sur- 

 rounding region. It was on this basis that the " mountain 

 sand " was subdivided as indicated in Nos. 12 and 13. 



Section at President, Pa. 



Thick- 

 ness Total 

 No. Feet Feet 



4. Berea sandstone. Coarse sandstone, consisting of 

 rather loosely-cemented white quartz grains 

 which are, however, much discolored, giving 

 the rock a spotty appearance. Pebbles aver- 

 aging the size of a pea occur, more or less 

 abundantly scattered through the mass 12 46 



3. Sandstone, more compact, fine-grained, massive, 



buff 15 34 



2. Shale, drab in color, arenaceous 1 19 



1. Sandstone, same as in No. 3 . '_ 18 18 



This section was added because it shows the character of the 

 Berea alonsr the Allegheny River and some distance east of 

 Oil City. It was found* just south of the R.R. station of Pres- 

 ident on the north side of the river. The striking thing about 

 it is the lithologic character of the upper part. Zones No. 1 

 and 3 are very typical. Unfortunately, the base is covered, so 

 that the presence of the Cussewago limestone could not be 

 determined. There is little doubt that it exists here, however, 

 since it may be found typically developed a few miles north of 

 this locality, where the dip of the rocks brings the base above 

 the level of the R.R. tracks. Another section was made at 

 Hunter (about 3 miles north). Here the upper coarse part of 

 the Berea was found to have a thickness of 22 feet. 



Ohio State University, Columbus, Ohio. 



